Drill.



L. J. G. VAN ES.

DRILL.

APPLICATION FILED MAY 1.1913.

Patented Oct. 6, 1914.

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WW1/Leones L. J. VAN ES.'

DRILL. I APPLICATION FILED MAY 1, 1913. y 1, 1 1 2.498., Patented 001;. 1914.

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LOUIS JEAN CHRTIEN lvan Es, or BATAVIA, NETHERLANDS nasa! INDIES.

DRILL.

inmensa Specioation of Letters Patent. application med my 1, 191s. serial No. 764,944.

To all whom 'it may concern: Y

Be it known that l,- Loins JEAN CHRrmN VAN Es, a subject of the Queen of the Netherlands, and residing at Batavia, in the Netherlands East Indies, have invented a new and useful mprovement in Drills; and

l do hereby declare the following to be a full, clear, and exact description of the same.

The invention, relates to a percussionv crease of pressure, a piston,'connected with;y

the drill is driven forward against the rock in opposition to the action of a spring, and, during the temporary diminution of pressure elfected by the resultingy recoil,l is returned by the spring lto its original position, -whereupon the valve again opens and the operation commences anew. The special valve referred )to has been arranged in the casing or on the movable piston, In the operation of either form, the valve must first be closed by the owing water before the piston itself, due to the consequent in crease of pressure, receives its motiom-in other words, there is a large phase-displace-` ment between the speed of the Vwater and the speed of the piston, so that the quantity of work, `which during the stroke is trans- -ferred from the water column to the yieldling piston and which is expressed by the equation which C represents a constant, the

'cross section of the water column, c the machine water that only does the work necessary for this closing and that has no eect upon the motion ofthe A such a. construction, the valve 1s closed re the piston is returned into the again befA the ater will act upon the .piston before its reversal and retard its motion. The molupward movement.

piston. VVit-hl vent-ion the" pistolr f is at the same time initivlfpos'ition, and the rising'pressure of' tion of the piston being then in the opposite direction to the flow of water a large rise of pressure occurs whichfmay even rise to triple the useful value and this high pressure will increase leakage to such an extent as to threaten the working of the machine, which as found in practice often stops when there is a leakage under normal pressure of only one per cent. lt results that these known devices have only a comparatively small striking power 'and small eiciency and often stop" by small leakage. According to the` present invention, and for the pur se of avoiding the defect mentioned, t e piston itself is formed as a controlling member acting as a slide-valve. rEhe result is that now the valve movement and the piston movement are identical, that is to say, take place entirely simultaneously. Consequently', the phase displacement eX- isting between the -speed of the water and the speed of the piston', is considerably lessened, so that the quantity of work transferred to the piston during the working stroke always retains a positive value, be-

cause c always remains positive in relation to c, and hence a -greatergstriking force is obtained with better eticiency.

The accompanying drawings show several forms of construction embodying the invention. A

Figures 1-3 show the subject matter of Patented ct. 6, figlia.,

the invention as a deep boring apparatus in three d ierent forms of construction.

Figs', 4 and 5 show thesame as a rock borlln the form shown in Fig. 1, the device consists, in familiar manner of the tubular rod a servin for the admission of the ressure or. v ushing water, which rod is elow formed Vinto an air-chamber and connected by the heavy 'rod o with the working c linder d. 'n the working cylinder d is At e strikin piston formed at its lower end asa plain rill i, w ich iston-is acted upon by springs h and g, the endency `of the rst .of which is to hold the piston in the raised position shown upon the drawing, while thelatter serves to retard the piston in the According to the informed as `a controlling member, and in Fig, 1 in such manner that the upper portion of the piston, exactly fitted into the central bore of the partition wall m of the cylinder, is provided with lateral recesses n ing machine in two forms of construction..

The manner of operation ofthe device is,-

i briefly, as follows: The pressure water flows Aio successively through the tubular rod a, the air chamber b, the heavy rod c, into \the upper portion of the cylinder al and thence through the recesses n, the lower portion of the cylinder, and the orices oto the base of the borehole, thence to riseagain to the surface' at the saine time flushing the bore-hole. When the water has reached a certain' speed the piston f will thereby be pressed downward against the action of the spring i, so that the passages ,formed by the recesses n are closed and the piston due to the consequent increase of pressure is ldriven powerfully downward upon the base of the bore-hole. Upon the recoil of the dammed up water the piston f will, during the consequent temporary diminution 'of pressure, be raised again by the spring li, whereupon the 01peration is repeated. As' is apparent t e opening and closingl of the'passages for the water iscom'pulsorily' edected at each strokev by the movement ofv the piston.

The form of construction shown in Fig. 2 dilfers from that described above in that the piston f itselfis hollow and is provided above with'lateral slit-like orifices p instead of the recesses n of Fig. l, which orifices eect the control of the water in the same manner as the recesses, the water iiowing 0H through the opening g provided at the bottom.

Fig. 3 shows a construction of the'boring device with control according to Fig. 2, in which the lower portion of the piston is formed as a crown drill instead of as a plain drill. rlhe manner of operation of the' control is not altered thereby.

liinally, Figs. 4t andl 5 show two forms' of construction of the subject matter of the invention suitable for roch drilling machinesi'or slight depths and small boreholes; lnwthis' lsmaller term of construction, a'lati/eralopening7l is also provided for the escape of a ortion of the used pressure water, while t e remainder is used for flushing the borehole, 'iiowing through the hole'in the piston and 'in the plain drill;

Ilclaim: 4 A t. lijn a 'percussion1 drill, the combination rilassa a of a cylinder having a constricted part; a piston reciprocating in said constricted part and provided with a closed head adapted to close the constricted part, and with inter-1 piston reciprocating in said constricted part and provi ed with a closed head .adapted to close the constricted part, and with intermediate recesses adapted to unclose said restricted part; a spring for raising the pis# ton; and a drill on the lower end of the piston, said drill having a Huid discharge passage therein,

3. ln a percussion drill, the combination of a cylinder; means for conducting fluid.

to the upper part of the cylinder, a partition in the cylinder provided with a bore; 'a piston within said cylinder and bore and having aclosed upper end adapted to close said bore and provided with intermediate recesses adapted to permitv the assage of iiuid vthrough the bore; yielda le means pressing'on said piston to move the upper end of the piston from they bore; and a drill attached to the piston. y

4. ln a percussion drill, the. combination of a cylinder havinga singlel outlet opening, a single inlet opening and a constricting bore between said openings and closed at its sides; and a piston in said cylinder and bore having a part 4adapted to close said bore when the piston is in one position and provided with passages permitting the piston is in another position.

5. In a ercussion drill, the combination vof a cylin er having 'outlet and inlet openings, and a constricting bore between said openings, the cylinder being free from openings adjacent to said? bore; and a piston-iii passage 'of fluid` through said bore when thel a cylinder having a constricted part g a said cylinder and bo're and having a part adapted to close saidbore when the piston is in one position and provided with-pasu sages permitting the .passage of Huid through said bore when another position. l .ln testimony whereof, lt have signed vmy namev to this specification in the presence of two subscribing witnesses.

tenis iriii ciisrrirlii mi -l/"Vitnesses:

M. lil/. dULIUs, Tra li., Gr. Zincnnn. j

the piston is in' 

